ES实战--集群扩展

查看ES集群状态:

GET /_cluster/health?pretty=true

当一个节点加入集群的时候,ES会自动地尝试将分片在所有节点上进行均匀分配.
如果更多的节点加入集群,ES将试图在所有节点上均匀分配分片数量.这样每一个新加入的节点都能通过部分数据来分担负载
第二个节点发现第一个节点,并且加入集群的方式: 广播或单播.ES可同时使用两者,不过默认的配置时仅使用广播,因为单播需要已知节点列表来进行链接

获取集群节点状态信息

GET /_cluster/state/master_node,nodes?pretty
#响应:
{
  "cluster_name": "elasticsearch",
  "cluster_uuid": "TmUQBp_9TsSG93CKys-WNg",
  "master_node": "I-O0ckoiRwOqqsU2Y_4bAw",
  "nodes": {
    "I-O0ckoiRwOqqsU2Y_4bAw": {
      "name": "hecs-21906",
      "ephemeral_id": "J0VupwLZQVGQkKWsD4BknQ",
      "transport_address": "127.0.0.1:9300",
      "external_id": "hecs-21906",
      "attributes": {
        "ml.allocated_processors": "2",
        "ml.max_jvm_size": "1790967808",
        "ml.allocated_processors_double": "2.0",
        "xpack.installed": "true",
        "ml.machine_memory": "3576066048"
      },
      "roles": [
        "data",
        "data_cold",
        "data_content",
        "data_frozen",
        "data_hot",
        "data_warm",
        "ingest",
        "master",
        "ml",
        "remote_cluster_client",
        "transform"
      ],
      "version": "8.8.2"
    }
  },
  "transport_versions": [
    {
      "node_id": "I-O0ckoiRwOqqsU2Y_4bAw",
      "transport_version": "8080299"
    }
  ]
}